CN103310953A

CN103310953A - Three-phase five-column arc extinction electric reactor

Info

Publication number: CN103310953A
Application number: CN2013101897823A
Authority: CN
Inventors: 李�杰; 徐锡舟; 洪振兴
Original assignee: JIANGSU HONGAN TRANSFORMER CO Ltd
Current assignee: JIANGSU HONGAN TRANSFORMER CO Ltd
Priority date: 2013-05-21
Filing date: 2013-05-21
Publication date: 2013-09-18
Anticipated expiration: 2033-05-21
Also published as: CN103310953B

Abstract

The invention discloses a three-phase five-column arc extinction electric reactor which belongs to the technical field of transformer design and manufacture. The three-phase five-column arc extinction electric reactor realizes the integral function of ground connection and arc extinction. An amorphous alloy with an air gap is first adopted for an iron core, and the end surface of the air gap has high smooth accuracy, so the noise caused by the adjustable air gap is effectively reduced; three main windings in the middle of the iron core are in star connection, a neutral-point is directly connected to ground, the columns on two sides are provided with air gaps and form a zero sequence magnetic access with the middle column; coils are wound on the columns on two sides, and three inductive loads with different reactive resistance are provided for the columns on the two sides to realize the rough adjustment and fine adjustment of a compensating current. The advantages of high magnetic permeability and low energy consumption of the amorphous alloy are fully utilized to overcome the defects caused by direct current excitation for a long time that the system is easy to become overheated, the active loss is large, the wave distortion of the compensating current is large, and the residue is large after compensation. The three-phase five-column arc extinction electric reactor is mainly used in high-voltage and intermediate-voltage electric power systems.

Description

A kind of three-phase five-limb arc-suppression reactor

Technical field

The present invention relates to a kind of three-phase five-limb arc-suppression reactor, belong to design of transformer manufacturing technology field.

Background technology

During the conductor energising, can produce magnetic field in its occupied certain space scope usually, the most popular says, can play the thing of the effect of impedance in circuit, just is its reactor.Yet the inductance of the long straight conductor of energising is less, and the magnetic field that produces is not strong, and therefore actual reactor is lead coiled solenoid form, claims air core reactor; Sometimes in order to allow this solenoid have bigger inductance, just in solenoid, insert iron core, claim iron-core reactor.

Owing to adopted reactor, when being short-circuited, the voltage drop on the reactor is bigger, so also played the effect of keeping the busbar voltage level, makes the voltage fluctuation on the bus less, has guaranteed the stability of the user's electric equipment operation on the non-fault line.Reactor is indispensable in electric power system as the reactive power compensation means.Damping reactor (also claiming series reactor usually) is in series with capacitor group or closely packed capacitor, in order to the inrush phenomenon of limiting capacitance device.

Usually, arc-suppression reactor is a kind of neutral point of isolated neutral system and single-phase reactor between the ground of being connected on, the direct-to-ground capacitance power current when being used for the compensation single phase ground fault.During isolated neutral system generation single-phase earthing, non-fault phase voltage raises and is line voltage, and the electric current of the fault point of flowing through equals 3 times of every phase capacitance currents.The electric current of fault point is bigger, and the electric arc of generation is difficult for extinguishing, and expands as phase fault sometimes.For this reason, the system neutral of being everlasting installs arc-suppression reactor additional, with inductive current building-out capacitor electric current, fault electric arc is extinguished rapidly.The profile of arc-suppression reactor is similar with single-phase transformer.Inside is actually to be wound by segment core with band gap and constitutes with coil.Because iron core has the gap, so the induction reactance value is more stable, can obtain bigger inductive current.Reactor is provided with some taps, so that in certain scope, the size of inductance is regulated in classification.

When single-phase arc-suppression reactor is used in the three-phase electrical power system, can only be respectively at every this arc-suppression reactor device that increases mutually, in use there is certain defective in this, and device is too many and complicated, also may bring the imbalance problem of three-phase extinguishing arc.

Summary of the invention

At above-mentioned defective and deficiency, the present invention introduces a kind of three-phase five-limb arc-suppression reactor, is grounded and extinguishing arc two bodies unification system.The main contents that relate to are as follows:

(1) non-crystaline amorphous metal that has air gap that adopts first unshakable in one's determination;

(2) middle three post main winding Y-connections unshakable in one's determination, neutral-point solid ground forms a similar grounding transformer;

(3) two side columns have air gap, and two side columns and intermediolateral column form the zero sequence flux path, and two side columns are wound with coil, and have three inductive loads that the reactance amount is different;

(4) reactor L1 and L2 are respectively by two contactor break-makes, and to realize the coarse adjustment of offset current, reactor L3 is by two antiparallel controllable silicon break-makes, and the size of regulating this inductive branch electric current, to realize the fine tuning of offset current;

(5) be applicable to by electric network capacitance and current from the full bucking-out system of motion tracking.

The invention has the beneficial effects as follows: (1), employing non-crystaline amorphous metal, the smooth precision height of air gap end face effectively reduces because the noise that adjustable air gap produces; (2), the adjustable linearity of inductance is accurate; (3), take full advantage of the high magnetic conduction low energy consumption of non-crystaline amorphous metal advantage, overcome when long DC excitation cause system easily overheated, active loss reach greatly that the offset current wave distortion is big, the residual big shortcoming in compensation back; (4), ground connection and extinguishing arc two bodies unification system, reduced cost.Be applicable to by electric network capacitance and current from the full bucking-out system of motion tracking.

Description of drawings

Accompanying drawing is the structure chart of three-phase five-limb arc-suppression reactor.

Among the figure, A, B, C are three-phase terminal, and L1 is reactor 1, and L2 is reactor 2, and L3 is reactor 3,, I _LBe the neutral ground electric current.

Embodiment

In conjunction with the accompanying drawings and embodiments, specify as follows:

Described invention is used for three-phase electrical power system, comprises five core limbs.The non-crystaline amorphous metal that has air gap that adopts first unshakable in one's determination, the smooth precision height of air gap end face can effectively reduce because the noise that adjustable air gap produces; At three middle posts unshakable in one's determination, the main winding Y-connection, neutral-point solid ground forms a similar grounding transformer; Two side columns all have air gap, and two side columns and intermediolateral column form the zero sequence flux path; Two side columns are wound with coil, and have three inductive loads that the reactance amount is different; Reactor L1 and L2 are respectively by two contactor break-makes, and to realize the coarse adjustment of offset current, reactor L3 is by two antiparallel controllable silicon break-makes, and the size of regulating this inductive branch electric current, to realize the fine tuning of offset current;

The adjustable linearity of described invention inductance is accurate, takes full advantage of the high magnetic conduction low energy consumption of non-crystaline amorphous metal advantage, overcome when long DC excitation cause system easily overheated, active loss reach greatly that the offset current wave distortion is big, the residual big shortcoming in compensation back.System earth and the unification of extinguishing arc two bodies reduce cost greatly.

Claims

1. three-phase five-limb arc-suppression reactor is characterized in that: adopt the amorphous alloy core that has air gap, apparatus structure designs novel three-phase and five-pole.

2. according to claim 1, it is characterized in that: three post main winding Y-connections in the middle of unshakable in one's determination, neutral-point solid ground forms a similar grounding transformer.

3. according to claim 1, it is characterized in that: two side columns have air gap, and two side columns and intermediolateral column form the zero sequence flux path, and two side columns are wound with coil, and have three inductive loads that the reactance amount is different.

4. according to claim 1, it is characterized in that: reactor L1 and L2 are respectively by two contactor break-makes, and to realize the coarse adjustment of offset current, reactor L3 is by two antiparallel controllable silicon break-makes, and the size of regulating this inductive branch electric current, to realize the fine tuning of offset current.

5. according to claim 1, it is characterized in that: ground connection and the unification of extinguishing arc two bodies.